4 Lug vs 5 Lug - Ford Mustang Forum
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post #1 of 2 (permalink) Old 09-12-2019 Thread Starter
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4 Lug vs 5 Lug

So I have a 1965 Mustang that currently has a 200 ci straight six in it. I am converting the drums to a disc brake setup and eventually swapping in a 289. How much of a performance difference will it have on my car if I stick with the 4 lug 6 cylinder wheels and not upgrade to 5 lug V8 wheels. I am looking to save a little money and not have to change the rear axle shafts and whatnot.

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post #2 of 2 (permalink) Old 09-13-2019
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Originally Posted by wyattjewett View Post
So I have a 1965 Mustang that currently has a 200 ci straight six in it. I am converting the drums to a disc brake setup and eventually swapping in a 289. How much of a performance difference will it have on my car if I stick with the 4 lug 6 cylinder wheels and not upgrade to 5 lug V8 wheels. I am looking to save a little money and not have to change the rear axle shafts and whatnot.
The only thing other than comparing performance of the 289 vs 200, is the DIAMETER of the tires used. Similar diameter 4-lug or 5-lug wheels and tires will not affect performance. More importantly, is the six-cylinder rear axle, which is an Integral type axle, never was used behind any V-8, regardless of wheel lugs. If you keep the present axle, you may experience trouble with it, with a V-8.

Both 8-inch and 9-inch Ford Removable Carrier axles were used behind V-8s, though in 1965 and possibly '66, only High-Performance 289s came with the 9-inch. By '67, 9s were more common, since the FE engines were introduced, those being 390 cubic inches.

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